Which weather conditions should be expected beneath a low level temperature inversion layer when the relative humidity is high?

• A. Smooth air, poor visibility, fog, haze, or low clouds
• B. Turbulence and gusts
• C. Clear air with no clouds
• D. Heavy rain

Answer: (A)

When a low-level temperature inversion is present, the air near the surface becomes very stable and resists vertical mixing. If the relative humidity is high, that moisture tends to condense at the surface, forming fog, haze, or low clouds, and visibility drops. The inversion acts like a lid, keeping air calm and preventing turbulence, which is why you’d expect smooth air rather than gusts or rough conditions. Heavy rain isn’t typical in this situation because the stable layer suppresses the rising motions needed to produce widespread precipitation. Clear air with no clouds would require drier conditions or dissipation of the inversion, which isn’t implied by high humidity.